When choosing an insert for a 16×16 pillow cover, opt for an insert that is 17×17 inches or 18×18 inches in size. The reasoning behind this is simple – a slightly larger insert will fill out the pillow cover properly, ensuring a plump appearance and comfortable support.
Understanding Pillow Insert Sizes
Before diving into the specifics of selecting the perfect pillow insert size, it’s important to understand the relationship between a pillow cover and its insert. It might seem logical to match the insert size exactly to that of the pillow cover, but this can often lead to a pillow that looks underfilled and lacks volume.
Pillow inserts should generally be about 1 to 2 inches larger than the pillow cover to achieve a full and robust look. This rule applies not only to square pillows but to rectangular and other shaped pillows as well.
Why Choose a Larger Insert?
Choosing an insert that is one to two inches larger than your pillow cover ensures that the corners are well-filled and the pillow looks inviting. Pillows serve both an aesthetic and functional purpose. Not only do they add a touch of style to your space, but they also provide comfort and support. A properly sized insert enhances the visual appeal while maintaining the usability of the pillow.
Our Top 5 Pillow Picks
Updated September 2026MFWW Cervical Contour Memory Foam Pillow
Best for neck pain. A dual-height ergonomic contour cradles your head and supports the neck, for back and side sleepers.
- Contour memory foam
- Dual-height design
- Cool breathable cover
Cooling Shredded Memory Foam Pillows, Standard, 2-Pack
Best value pair. Shredded foam you can adjust to your loft, with a cool-gel feel and no solid-block heat. Two pillows in one box.
- Adjustable shredded foam
- Cool gel
- Hypoallergenic
- Standard 2-pack
Cooling Shredded Memory Foam Pillows, Queen, Set of 4
Best for the whole household. The same adjustable cooling foam in queen size, four to a set, so every bed in the house gets an upgrade.
- Adjustable shredded foam
- Cool gel
- Hypoallergenic
- Queen set of 4
Utopia Bedding Hotel Pillows, Queen, Set of 4
Best hotel-style set. Plush, cooling pillows made to suit side, back and stomach sleepers alike. A safe pick for guest rooms.
- Queen set of 4
- Cooling
- All sleep positions
- Hotel style
Zalmureta Goose Feather & Down Pillows, Queen, Set of 2
Best luxury pick. A three-chamber goose feather and down fill wrapped in a 100% cotton shell, for that five-star-hotel feel at home.
- Goose feather & down
- 3-chamber design
- 100% cotton shell
- Queen 2-pack
Pillow Insert Materials
The material of your pillow insert also plays a crucial role in how your pillow will look and function. Let’s explore the most common types of pillow inserts and how they impact the choice of size.
Down and Feather Inserts
Down and feather pillow inserts are known for their softness and ability to hold shape. With these types of inserts, you can usually go for an insert that is exactly 1 inch larger than your pillow cover. Since down and feathers are more compressible, they will fill the cover nicely without making it appear overstretched or lumpy. These inserts can be more expensive, but they have the advantage of longevity and a classic level of comfort.
Polyester Inserts
Polyester fiberfill is a more affordable alternative to down and is hypoallergenic. Polyester inserts are firmer and might require a bit more bulk to look full. Opting for an insert that is 2 inches larger could be a good choice here. Always ensure that the polyester is evenly distributed in the insert to avoid a lumpy appearance.
Foam Inserts
Foam inserts are the firmest option and are often used for more structured decorative pillows. Since foam doesn’t move around within the cover, a closer size match may work well. However, given that foam inserts are less pliable, you should still consider an insert slightly larger than the cover to avoid a flat look.
How to Measure Your Pillow Insert
When you’re in the market for a pillow insert, having the right measurements is key. It’s worth taking a moment to correctly measure your pillow cover before making a purchase.
Step-by-Step Measuring Guide
1. Lay your pillow cover flat on a surface and smooth out any wrinkles.
2. Measure from one side seam to the other side seam, across the middle of the pillow cover, to get the width.
3. Measure from the top seam to the bottom seam, across the middle of the pillow cover, to get the height.
4. Write down your measurements. If they are indeed 16×16 inches, you’ll be looking for an insert that is 17×17 inches or 18×18 inches, as mentioned before.
Shaping and Adjusting Your Pillow
Once you’ve chosen the right size insert for your pillow cover, the next step is to ensure it fits snugly and looks appealing.
Inserting the Pillow
1. Start by folding the insert in half or squeezing it to make it easier to fit inside the cover.
2. Carefully stuff the insert into the pillow cover, making sure to push it into each corner.
3. Once the insert is inside, fluff and adjust the pillow by patting it and pushing the fill towards the corners until it has an even distribution and a smooth surface.
Maintaining Pillow Shape
Regular fluffing and rotating of your pillows will ensure that they maintain their shape. Occasionally remove the insert and fluff it manually, much like you would a bed pillow, to keep the fill from settling too much in one area.
Considerations for Specific Uses
When selecting the size of a pillow insert, also consider what the pillow will be used for. Decorative pillows might be fine with just that touch of extra size for a full look, whereas a pillow you’ll be resting on regularly could benefit from the extra inch to ensure it doesn’t compress too much in use.
Finishing Thoughts
Choosing the right size insert for a 16×16 pillow cover is essential if you want your pillow to look its best. Remember, a pillow insert that is 17×17 inches or 18×18 inches will usually provide the best results for a standard 16×16 pillow cover, resulting in a plush, inviting pillow. Consider the material and intended use before settling on the exact size to ensure comfort meets style in perfect harmony. Regular care and adjustment will prolong the life and appearance of your pillows, so give them a little attention now and then. Your cozy corner or elegantly made bed will thank you for it.
